diff --git a/.gitignore b/.gitignore
index 7fb0613..12f5971 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 .idea/
 printStream/
 .gradle
-.DS_Store
\ No newline at end of file
+.DS_Store
+build/
+*.iml
\ No newline at end of file
diff --git a/TDDIntro.iml b/TDDIntro.iml
deleted file mode 100644
index f8f190b..0000000
--- a/TDDIntro.iml
+++ /dev/null
@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="TDDIntro" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="" external.system.module.version="1.0" type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="false">
-    <output url="file://$MODULE_DIR$/build/classes/main" />
-    <output-test url="file://$MODULE_DIR$/build/classes/test" />
-    <exclude-output />
-    <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
-      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
-      <sourceFolder url="file://$MODULE_DIR$/src/test/resources" type="java-test-resource" />
-      <excludeFolder url="file://$MODULE_DIR$/.gradle" />
-      <excludeFolder url="file://$MODULE_DIR$/build" />
-    </content>
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" scope="TEST" name="Gradle: junit:junit:4.11" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.mockito:mockito-all:1.9.5" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.hamcrest:hamcrest-core:1.3" level="project" />
-    <orderEntry type="library" exported="" name="Gradle: joda-time:joda-time:2.7" level="project" />
-  </component>
-</module>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index f9306e0..6329d31 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,6 @@
 apply plugin: 'java'
 
-sourceCompatibility = 1.5
+sourceCompatibility = 1.7
 version = '1.0'
 
 repositories {
@@ -10,6 +10,6 @@ repositories {
 dependencies {
     compile 'joda-time:joda-time:2.7'
     testCompile group: 'junit', name: 'junit', version: '4.11'
-    testCompile group: 'org.mockito', name: 'mockito-all', version: '1.9.5'
+    testCompile group: 'org.mockito', name: 'mockito-core', version: '1.9.5'
     testCompile 'org.hamcrest:hamcrest-core:1.3'
 }
\ No newline at end of file
diff --git a/src/test/java/com/thoughtworks/voidmethods/BookBannerTests.java b/src/test/java/com/thoughtworks/voidmethods/BookBannerTests.java
index 411370e..1e2a3c0 100644
--- a/src/test/java/com/thoughtworks/voidmethods/BookBannerTests.java
+++ b/src/test/java/com/thoughtworks/voidmethods/BookBannerTests.java
@@ -1,6 +1,5 @@
 package com.thoughtworks.voidmethods;
 
-import com.sun.javaws.jnl.LibraryDesc;
 import org.junit.Test;
 
 import java.util.ArrayList;